To be a great coworking or office space, you need the following:
-Freedom from egregious noise
-24/7 access with key cards
-Decent kitchen & coffee
Unfortunately Coworkingness, despite its friendly community and great location, doesn't have this.
The rooms are relatively small, with hard wood floors, so if you have a noisy coworker shouting on the phone often (as I did) you'll find it hard to concentrate. I also felt like I was making a huge amount of noise walking past everyone on the squeaky, click-clacking hardwood floors. There's a reason 'professional' offices have carpet - it eliminates noise from foot traffic, and absorbs sound overall.
The desk size is reasonable, but my chair was butting up against another desk. Whenever someone wanted to get past me, I would have to squeeze forward a bit.
The office is technically accessible after hours and on weekends, but deserted and technically closed. There is no key-card access either, and many people didn't have keys at all - you'd have to be buzzed in by another coworker.
The internet speed when I was there was about 100/100, shared between 20 people. It wasn't a problem for my work, but it seems strange to have such a low speed in a country where fibre connections are so cheap.
The kitchen was very weak, too small, without even a microwave (!) when I was there. The refrigerator was overfull, generally too small, and some days the kitchen would smell mildly of garbage. There was a small pod coffee machine, with a supply of pods that you can buy (money in a jar), but you'd have to supply your own milk!
The location was great though, and the other coworkers were very friendly. There were lots of places nearby to eat.
Overall this is the kind of place suitable if you are a remote employee for another company or working on a small and straightforward existing online business. Anything more than that - rapidly scrambling to assemble a hot startup, for instance - requires the kind of comfort (from noise) and 24/7 access that unfortunately Coworkiness does not offer.
Coworking spaces in Poland overall, outside of Krakow and Warsaw, seem to be very weak, so this is still the best Coworking space available in Poznan, but if you're coming from other international tech hubs or from coworking spaces in Western Europe you'll be disappointed. I think the Coworking spaces in 2nd-tier Polish cities like Poznan need some kind of direct local Government support to get them up to an international best standard.